Proposal code
w063
Proposal title
What causes the turnover spectrum in GPS sources ?
The |
Investigators and their |
Affiliations |
| P.I. |
Satoko SATOH |
NAO Japan |
| |
Makoto INOUE |
NAO Japan |
| |
Katsunori M. SHIBATA |
NAO Japan |
| |
Seiji KAMENO |
NAO Japan |
| |
Kiyoaki WAJIMA |
ISAS Japan |
Proposal Abstract
GHz-Peaked Spectrum (GPS) sources have convex spectra
with the peak frequency in GHz range.
Turnover spectrum in GPS source is considered to be due to
synchrotron self absorption or free-free absorption.
Recently, our VSOP observation of a GPS source, OQ208,
showed asymmetric absorption towards double lobes of OQ208.
This result suggests free-free absorption external plasma existing
around the source.
We propose VSOP observations at 1.6 and 5 GHz
of the nearest GPS source NGC 1052
to confirm whether free-free absorption is common
characteristic in GPS sources or not.
For this study,
it is neccesary to observe optically thick part of the spectrum
with enough high resolution, and only VSOP observations
towards nearby GPS
allow us to obtain high resolution images at 1.6 and 5 GHz.
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